Question

A block of weight 5N is placed on a horizontal table. A person push the block from to p by exerting a downward force of 3N on it. Find the force exerted by the table on the block.

Answer 1

$\textbf{ Hello Mate! }$

Let's understand the concept first.

How are weight and force is related?

Weight is the amount of force applied by body on ground. This means that block was initially applying force towards .

Force applied downwards = 5 N

In addition, person applied 3 N force from top of block.

Force applied by person downward = 3 N

Total force applied downwards = 5 N + 3 N

= 8 N

Thus, block applied 8 N force on table. This is an actionary force.

By newton's 3rd law of motion, " To every action, there is equal and opposite reaction acting on two different bodies."

Thus, table will apply - 8N force. Negative sign shows force applied in opposite direction of motion.

$\boxed{ \textsf { \red{ Hence,\:force\:applied\:by\:table\:is\:8N }}}$

Have great future ahead!

Answer 2

Answer:

There are three forces acting on the body:

(i)    5 units, downward by earth.

(ii)    3 units, downward by the person.

(iii)   F, upward by the table.

As the block is at rest, the resultant force on it must be zero.The total downward force is 5 units +3 units =8 units. Hence, the upward force F should be 8 units. So, the force exerted by the table on the block is 8 units in the upward direction.

Explanation: